LG LFX28968SW Service Manual - Page 28

Replace Main PCB

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8-5 Defrost Heater Error (Er dH) No Checking flow Result & SVC Action 1 Check the Door gasket. Part Result SVC Action 2 Check the Defrost control part. Fuse-M 0 Ω Other Go to the 3 Change Controller Assembly (Position No.400A ) Fust M Def' Sensor 34~42 Ω Go to the 3 Defrost Heater Other Change Controller Assembly (Position No.400A ) Def' Heater Defrost Sensor 0 Ω OFF Go to the 3 Replace product 3 Input Test 3 Mode. (Push the button 3 times) 4 Check the Blue(Pin4) to Orange(Pin9) at CON3 on the main PCB 5 Release the test mode. push the button 1 times. (normal) Result 112 ~ 116 V 0 V SVC Action Go to the 5 Replace Main PCB 6 Check the Blue(Pin4) to Orange(Pin9) at CON3 on the main PCB Result 0 V 112 ~ 116 V SVC Action Explain to customer Replace Main PCB - 28 -

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- 28 -
8-5
Defrost Heater Error (Er dH)
Fuse-M
Defrost
Heater
Defrost
Sensor
0
Ω
Other
34~42
Ω
Other
0
Ω
OFF
Go to the 3
Change Controller Assembly
(Position No.400A )
Go to the 3
Change Controller Assembly
(Position No.400A )
Go to the 3
Replace product
Part
Result
SVC Action
No
1
2
Checking flow
Check the Door gasket.
Check the Defrost control part.
3
Input Test 3 Mode.
(Push the button 3 times)
4
Check the Blue(Pin4) to Orange(Pin9)
at
CON3 on the main PCB
Result & SVC Action
Def'
Heater
Fust
M
Def'
Sensor
5
Release the test mode.
push the button 1 times. (normal)
<CON3>
Result
112 ~ 116 V
0 V
SVC Action
Go to the 5
Replace Main PCB
6
Check the Blue(Pin4) to Orange(Pin9)
at
CON3 on the main PCB
Result
0 V
112 ~ 116 V
SVC Action
Explain to customer
Replace Main PCB
<CON3>